꼼치의 난발생과 부화자어

Egg Development and Larvae of the Snailfish, Liparis tanakai (Gilbert et Burke)

1985년 12월 21일 경남 통영군 사량도와 두미도사이 해역에서 통발로 채집한 꼼치수정란의 난발생과정과 부화자어의 형태에 관하여 관찰한 결과를 요약하면 다음과 같다. 수정란은 구형이며 담황색을 띤 침성점착난으로 난경은 $1.68{\sim}1.78mm$(평균1.72mm, n=30)이며 20여개의 유구를 가진다. 실내사육수온 $8.1{\sim}11.8^{\circ}C$(평균 $9.2^{\circ}C$)에서 포배기후 21일만에 부화하였다. 부화직후의 자어는 전장 $5.70{\sim}6.41mm$(평균 6.10mm, n=30)였으며 근절수 $7{\sim}9+36$. 흑색소포는 큰 가슴지느러미, 복강과 난황 위에 밀집되어 있다. 부화후 12일째의 자어는 전장 $5.85{\sim}6.46mm$였으며 난황을 거의 흡수하고 주둥이와 후두부에 흑색소포가 나타난다.

Snailfish, Liparis tanakai (Gilbert et Burke) is widely distributed in the coastal waters of Korea and Japan. On December 21, 1985, fertilized eggs of the fish were collected from the coastal waters of Saryang-do island, Kyongsangnam-do, Korea, and the eggs were incubated and the larvae reared at a mean water temperature of $9.2^{\circ}C$ in the laboratory. The fertilized eggs of this species are demersal, adhesive and spherical in shape, measuring $1.68{\sim}1.78mm$ (mean 1.72mm, n=30) in diameter, containing about 20 oil globules. Hatching took place 21 days after blastula stage. During the incubation period water temperature fluctuated between $8.1^{\circ}C\;and\;11.8^{\circ}C$. The newly hatched larvae were $5.70{\sim}6.41mm$ (mean 6.10mm, n=30) in total length with $7{\sim}9$ (abdominal) and 36 (caudal) myomeres. Many melanophores were distributed on the large pectoral fin, yolk sac and peritoneum. Twelve days after hatching, the larvae attained $5.85{\sim}6.46mm$ in total length, and at this time the larvae absorbed the yolk almost completely. Melanophores appeared on the snout and the posterior part of head.